This isn’t about separating religion from school. It’s about having sensitivities for peoples way of life. There are a lot of things you wouldn’t be able to get away with outside of depicting Muhammad in art. And none of them related to Muslims.
Not sure if the professor felt existential about it but she said:
“I am showing you this image for a reason. And that is that there is this common thinking that Islam completely forbids, outright, any figurative depictions or any depictions of holy personages. While many Islamic cultures do strongly frown on this practice, I would like to remind you there is no one, monothetic Islamic culture,”
Some cultures are just more violent ( eg. Look at fifa world cup and marocco people through Europe).
Are you denying that they are more violent?